Understanding Sharpness.

Sharpness describes the clarity of detail in a photo, and can be a valuable creative tool for emphasizing texture. Proper photographic and post-processing technique can go a long way towards improving sharpness, although sharpness is ultimately limited by your camera equipment, image magnification and viewing distance. Two fundamental factors contribute to the perceived sharpness of an image: resolution and acutance.

"For digital cameras, resolution is limited by your digital sensor, whereas acutance depends on both the quality of your lens and the type of post-processing. Acutance is the only aspect of sharpness which is still under your control after the shot has been taken, so acutance is what is enhanced when you digitally sharpen an image (see Sharpening using an "Unsharp Mask")."

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